ZBasicRef - page 144 of 235

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ZBasic Language Reference

ZBasic Microcontrollers

A third method of guaranteeing atomicity is to explicitly disable and re-enable interrupts as depicted

Dim i as Integer

Register.SREG = &H00

Register.SREG = &H80

Although this technique may be useful in rare cases, its use is strongly discouraged. The primary

problem with this method is that it unconditionally re-enables interrupts without regard to whether or not

interrupts were enabled beforehand. A related technique using inline assembly language code, having

the same disadvantage, is shown below.

Dim i as Integer

6.5 Attributes for Procedures and Variables

This section describes several special attributes that you can apply to variables or procedures with native

mode devices to obtain special effects. To apply special attributes, you list the desired attributes (see the

table below) in a comma-separated list enclosed in parentheses following the keyword Attribute. This

entire construction is placed at the end of a normal variable, subroutine or function definition as illustrated

in the example below.

Special Attributes

Instructs the compiler to “inline” the code for the

subroutine/function instead of generating a call.

Generally, this yields faster execution, sometimes at the

expense of larger program size.

Instructs the compiler not to “inline” the code for the

subroutine/function and, instead, generate a call to the

subroutine or function.

Instructs the compiler to include the variable or

procedure in the executable even if it appears not to be

used. This is useful, for example if external C or

assembly code needs to use a ZBasic data item or

procedure but it is not otherwise used in the program.

Instructs the compiler to create an alias for the

procedure or variable having the specified <name>. This

is useful on native mode devices to allow external code

to refer to a ZBasic procedure or variable by a pre-

determined name.

Instructs the compiler allocate space for the variable

statically. This attribute is redundant for variables

defined at the module level since that is the default for

those. In contrast, variabled defined within a procedure